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target/arm: Honour HCR_EL2.TGE when raising synchronous exceptions

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Whene we raise a synchronous exception, if HCR_EL2.TGE is set then
exceptions targeting NS EL1 must be redirected to EL2. Implement
this in raise_exception() -- all synchronous exceptions go through
this function.

(Asynchronous exceptions go via arm_cpu_exec_interrupt(), which
already honours HCR_EL2.TGE when it determines the target EL
in arm_phys_excp_target_el().)

Backports commit 7556edfb4d7bf0583c852c8cfc49ef494c41dd8a from qemu
This commit is contained in:
Peter Maydell 2018-08-16 06:41:55 -04:00 committed by Lioncash
parent 6b8d98bcd2
commit 3979058dcb
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1 changed files with 14 additions and 0 deletions
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14
qemu/target/arm/op_helper.c
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@ -32,6 +32,20 @@ static void raise_exception(CPUARMState *env, uint32_t excp,
{
CPUState *cs = CPU(arm_env_get_cpu(env));
if ((env->cp15.hcr_el2 & HCR_TGE) &&
target_el == 1 && !arm_is_secure(env)) {
/*
* Redirect NS EL1 exceptions to NS EL2. These are reported with
* their original syndrome register value, with the exception of
* SIMD/FP access traps, which are reported as uncategorized
* (see DDI0478C.a D1.10.4)
*/
target_el = 2;
if (syndrome >> ARM_EL_EC_SHIFT == EC_ADVSIMDFPACCESSTRAP) {
syndrome = syn_uncategorized();
}
}
assert(!excp_is_internal(excp));
cs->exception_index = excp;
env->exception.syndrome = syndrome;